Mr. P. Suetterling Profile

P. Suetterling

at Institute for Solar Physics

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Proceedings Article | 11 June 2021 Open Access

Paving the way to daytime optical feeder links based on LGS assisted adaptive optics

D. Alaluf, M. Centrone, D. Bonaccini Calia, P. Suetterling, R. Speziali, M. Faccini, W. Hackenberg, J. Perdigues Armengol, A. Di Paola

Proceedings Volume 11852, 118525Y (2021) https://doi.org/10.1117/12.2600028

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We report on experiments performed with the Swedish Solar Telescope (SST) located in La Palma (Canary Islands) to observe the sodium Laser Guide Star (LGS) during daytime. The ESO Wendelstein Laser Guide Star Unit 20W CW 589nm laser was used to generate an LGS plume at Earth’s Mesosphere, the laser launch telescope being at a distance of 92m from the SST, where a special daytime receiver was installed. The photometry of the LGS plume and the background effects were measured as a function of the angular separation between the plume and the Sun. The ultimate goal is to demonstrate closed-loop LGS Adaptive Optics (AO) during daytime, for Optical Feeder Satellite Communications operating 24/7, as well as for astrophysics of the Sun Coronal Mass Ejections. Other applications of daytime LGS-AO are for thermal imaging of astrophysical objects. This paper presents several system aspects of the daytime LGS-AO setup and discusses the experimental results obtained. We conclude that using an ultra-narrow band magneto-optical filter installed in the daytime SST receiver, the sky background flux is very efficiently suppressed and the LGS flux is well sufficient to drive LGS-AO during daytime for correction at visible wavelengths.

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